Scaffold and scaffold-clamp



UNIT D STATES PATENT Genres.

JAMES MCINTYRE AND JOHN G. MOINTYRE, 0F DETROIT, MICHIGAN.

SCAFFOLD AN D SCAFFO LD-C LAM P.

SPEGIFICATION forming part of Letters Patent No. 529,745, dated November 27, 1894. I

. Application filed August 14, 1893' Serial No. 483,130. (No model.)

To all whom, it may concern.-

Be it known that we, JAMES MOINTYRE and JOHN G. MOINTYRE, citizens of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Scalfolds and Scaffold-Clamps; and we declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification;

Our invention relates to an improved scaffold and scaffold clamp, and consists of the devices and appliances, their construction, combination and arrangements as hereinafter described and claimed, and illustrated in the accompanying drawings, in which Figure 1 is a view in perspective,showing our invention employed in the erection of a scafiold. Fig.2 is aview showing the clamp applied to the put-log and upright, the upright being in section. Figs. 3 to dare-similar views, showing modifications of our device. Fig. 6 also shows a method and means of attaching the rear end of the put-log to a frame building. Fig. 7 is a cross section on the line 2-2, Fig.1. Fig. 8 is a cross section on the line 5+5, Fig. 5.

In the erection of buildings, it is well known, that considerable difficulty has here tofore been experienced in the erection of the necessary scaffolds. Their proper erection not only requires firmness, but also means for their erection as quickly and as economically as possible.

Our invention is designed to secure these objects, at the same time to secure a scafiold of superior strength.

We carry out our invention as follows: A represents the uprights, which may consist of poles or scantling or other suitable timber. B represents a put-log consisting of a single straight piece of timber usually extending essentially at right angles to the uprights, upon which the boards or planks C are laid.

D represents a building. In Fig.1 the building is indicated of brick, in which instance it is common to rest the inner ends of the putlogs in or upon the'wall, a brick being omitted to permit the resting of the inner end of the put-log upon the wall, the consequent cavity being filled when the scaffold is taken down. In this instance no attachments are required at the inner ends of the put-logs.

form of the upright.

E represents our improved clamp, constructed of a metal body E, engaged upon the end of the put-log, the body of theclamp being provided with arms e and 6', engaging two sides of the put-log and united thereto in any suitable manner, as by means of a bolt E and nut e The-outer face of the body of the clamp may either be formed of-straight or curved form, as may be desired, to rest against the upright. Where poles are to be employed, said surface might be made of curved form, and straight when scantling is to be employed. ,We prefer also that the'outer end of the body of the clamp should be formed-with fastening devices e and 2 for the engagement therewith of a suitable clamping band or chain and a tighten-ing bolt. Thus, as shown in Fig. 2, and upon the-put-log at the-right hand in Fig. 1,

a chain E engages at one end with the fas tening device 6 saidfastening device being formed into a hook, over which any link of said chain may be readily engaged. At the outer end of said chain is a metal bar E having an eye engaged with the chain, as shown at 8 A threaded bolt E is provided with an eye at 6 to engage with the fastening device efiisaid fastening device being formed into a loop, the outer or threaded end of the bolt being passed through the adjacent e suitab e nut-E whereby the clamp may be quickly and firmly secured upon the upright. It will be perceived that the chain E may readily be shortened up if desired by engaging one of its links over the fastening device 2 while the nut E may readily be tightened up to bind the clamp upon the upright I gaged with the upright, whatever may be the I ohm bar E and providediwith a r. I

release or apply the clamp it will not be required fully to remove the nut E, as the nut may be suitablyloosened up to permit the chain being disengaged from the adjacent ear. The bar E may either be made straight or curved as may be desired.

In the modification shown in Fig. 3, the bar E is omitted and the eye of a bolt E is engaged with the chain E the threaded end of the bolt being passed through a fastening device 6 and receiving a nut 1L adjacent thereto. In the form shown in Fig. 4, in addition to the chain E, a metal plate E is jointedly engaged with the corresponding ear on the body of the clamp, and the bolt E is connected with the chain at one end and passed through the bar E receiving a nut E at the outer end thereof, as shown.

In the form shown in Fig. 5, links e are jointedly engaged with the fastening devices upon the body of the clamp and connected at their outer ends by a plate E. A movable plate E has a sliding engagement at its ends upon the links e A bolt e united to the plate E has a threaded engagement in the plate E and is provided with an op erating stem orhandle e One of the links e is hookedover the adjacent fastening device. By tightening up the bolt 6" the device is firmly clamped upon the upright.

In the form shown in Fig. 6, the chain E is dispensed with, and a perforated bar E has a jointed engagement at one end with the corresponding ear u pon the body of the clamp. The bar E" provided with a hook at one end is engaged with the outer end of the bar E which is provided with an eye, as shown at e The bolt E is hooked upon the adjacent ear of the body of the clamp and is passed through the adjacent end of the bar E, the nut E being engaged on the outer end thereof. The book upon the bar E may he engaged in any one of the perforations of the bar E. In all these modifications the principle and method of application are essentially the same, the all important feature common to each being to compress the adjacent portion of the clamp upon the upright. In all these cases the body of the clamp is permanently engaged upon the put-log and the clamp being applicable to any form of upright, a party provided with put-logs, having these clamps secured thereto, is always in readiness to erect his scaffold either with poles or scantling or other timber, as may be most convenient and desirable. Put-logs provided with our improved clamps are easily transported.

\Vhere the put-logs are to be engaged to a frame building we prefer to provide the inner end of the several put-logs with a clamp F, constructed of a body E, which may be similar tothe body E, having arms f and f' united bya bolt F and nut f The body is also provided with an ear f through which is passed a hook bolt F which may bepassed through the sheathing D of the building and hooked about the studding D its outer end being provided with a nut F to tighten the hook bolt in place upon the studding.

Where a scaffolding is required to be erected adjacent to a building already completed, additional uprights might be located at the inner ends of the put-logs adjacent to the building, in which case the put-logs would be provided also at their inner ends with the clamps E to engage the additional uprights. No horizontal braces are required in erecting a scaffold in this manner, but the uprights may be braced by suitable diagonal braces G. The diagonal braces may be engaged upon the uprights by a clamp H made similar to the clamps E except that in this instance instead of the body E being at tached to a put-log, simplyaconnecting metal body or band H is employed in connection with a clamping chain H A bolt H is engaged with the chain and passed through the plate H, a nut H engaging the bolt therewith. In this case the opposite end of the plate H may be formed with a hook to engage one of the links of the chain. It will be seen that this construction forms a very strong scaffold.

It will be seen that no horizontal timber is required to form the scafiold save the put-logs, and that tne upright rests against the end of the put-log, the body forming a seat for the upright between it and the face of the put-log.

It is evident that the collar is contractible so that the body of the clamp with its collar maybe tightly compressed against all sides of the upright, thereby holding the upright most firmly in the grasp of the clamp, and avoiding any possibility of slipping.

What we claim as our invention is- 1. A scaffold having in combination a putlog, consisting of a single piece of timber, an upright, and a clamp uniting the putlog with the upright, said clamp consisting of a metal body permanently engaged with the end of a putlog provided with a contractible clamping collar to embrace the upright, and a tighten ing bolt arranged to contract the collar and tighten it upon the upright, substantially as set forth.

2. A scaifold having in combination a putlog, an upright lying against the end face of the putlog, a clamp having a body permanently engaged with the putlog and intervening between the end of the putlog and the side of the upright, said clamp provided with a contractible clamping collar embracing the upright, and a tightening bolt arranged to contract the collar and tighten it about the upright, substantially as set forth.

3. The combination with a putlog of ascaffold clamp consisting of a body permanently engaged with the end of the putlog, forming a seat on the end face thereof for the upright of-the scaffold, said body provided with. a

contractible clamping collar to embrace an upright, and means to contract the collar and compress it against the surfaces of the upright, substantially as set forth.

4. The combination with a pntlog of a scaffold clamp consisting of a body permanently engaged with the pntlog and provided with a contractible clamping collar to embrace an upright, and with atightening bolt to contract the collar and tighten it upon the upright, said body formed with fastening devices at its outer end to engage the collar, and with a seat for the upright between said fastening devices, said collar having a detachable engagement with one of said fastening devices, substantially as set 'forth.

5. Ascaflfold having in combination a putlog consisting of asingle'piece of timber, an upright resting against the end face of the pntlog, a clamp consisting of a'body permanently engaged with the pntlog and intervening between the end of the pntlog and the up- 1'ight, said body provided with a contractible collar consisting of a chain engaged with said body, abar connected with said chain, a bolt connecting said bar with said body, and a nut upon said bolt to contract the bolt bar, and chain upon the upright, said body forming a seat for the upright between said bolt and chain, substantially as set forth.

6. In a scalfold the combination of an upright, a put-log,a clamp engaged with the putlog provided with a clamping collar, and a bolt to tighten the collar upon the upright, braces engaged with the upright, and a clamping collar provided with a tightening bolt embracing said upright and braces, substantially as described. I

7. In a scaffold, the combination with a put log, of a clamp consisting of a body, a clamping collar and bolt to tighten the collar upon the upright of the scafiold, and a hook-bolt F engaged with the opposite end of said putlog, substantially as described.

In testimony whereof we sign this specification in the presence of two witnesses.

JAMES MOlNTYRE.

' JOHN G. MOINTYRE. Witnesses:

N. S. WRIGHT,

JOHN F. MILLER. 

